So I am new to the thumper

dedelmon

I just purchased a 99 YZ400F this past weekend. Its a very low-hour bike, all stock except for front/rear springs. I have been reading many of the post in this forum and it is calming my fears about the bike. I have the typical flaming hot header pipe and some exhaust popping on deceleration (very little, but some). The bike runs great and has plenty of power. I switched from a 2-stroke 250 to this so I could ride more with my young son and not worry about fouling plugs. The problem I have now is that when I am putting around with him, it feels like there is a campfire between my legs. Should I worry about overheating this thing if I am riding around in 1st gear with my kid?

642MX

The problem I have now is that when I am putting around with him, it feels like there is a campfire between my legs. Should I worry about overheating this thing if I am riding around in 1st gear with my kid?

A campfire?

YZF's require a lot of air passing thru the radiators to keep it cool. If you must putt around, then you should use a product like Engine Ice or Red Line Water Wetter for the radiator. There is another product called 2twocool (TT store has it) that lowers the engine temperature quite a bit. I'm doing my own testing with the 2twocool and will do a right up on it in the near future, but for now, I can tell you that it works as advertised.